UFC 207 takes place Friday at T-Mobile Arena in Las Vegas, and the main card airs on pay-per-view following prelims on FS1 and UFC Fight Pass.

In the headliner, Nunes puts her belt on the line for the first time. Rousey, meanwhile, returns for the first time since losing the title to Holly Holm in a massive upset at UFC 193 more than a year ago. Since that loss, the belt has been in the hands of Holm, Miesha Tate and now Nunes, who’s No. 1 in the USA TODAY Sports/MMAjunkie MMA women’s bantamweight rankings (Rousey is No. 2).

Matt Brown performed an honest career calculation that led him to his decision to retire after his next fight. His opponent, Diego Sanchez, seems to have chosen the opposite path. For many aging fighters, these are the two choices, and neither is an easy one to make.